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Derivative Instruments (Table Text Block) | 6 Months Ended
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Sep. 30, 2013
Derivative Instrument Detail [Abstract] |
Derivatives |
| Original variable rate debt amount |  | Agreement Date |  | Effective Date |  | Expiration Date |  | Designated cash flow hedge date
| (Unaudited)
$ | 300.0 |  |  | 8/16/2006 |  | 8/18/2006 |  | 8/10/2018 |  | 8/4/2006
| 30.0 |  |  | 2/9/2007 |  | 2/12/2007 |  | 2/10/2014 |  | 2/9/2007
| 20.0 |  |  | 3/8/2007 |  | 3/12/2007 |  | 3/10/2014 |  | 3/8/2007
| 20.0 |  |  | 3/8/2007 |  | 3/12/2007 |  | 3/10/2014 |  | 3/8/2007
| 19.3 | (a) |  | 4/8/2008 |  | 8/15/2008 |  | 6/15/2015 |  | 3/31/2008
| 19.0 |  |  | 8/27/2008 |  | 8/29/2008 |  | 7/10/2015 |  | 4/10/2008
| 30.0 |  |  | 9/24/2008 |  | 9/30/2008 |  | 9/10/2015 |  | 9/24/2008
| 15.0 | (a) |  | 3/24/2009 |  | 3/30/2009 |  | 3/30/2016 |  | 3/25/2009
| 14.7 | (a) |  | 7/6/2010 |  | 8/15/2010 |  | 7/15/2017 |  | 7/6/2010
| 25.0 | (a) |  | 4/26/2011 |  | 6/1/2011 |  | 6/1/2018 |  | 7/1/2011
| 50.0 | (a) |  | 7/29/2011 |  | 8/15/2011 |  | 8/15/2018 |  | 7/29/2011
| 20.0 | (a) |  | 8/3/2011 |  | 9/12/2011 |  | 9/10/2018 |  | 8/3/2011
| 15.1 | (b) |  | 3/27/2012 |  | 3/28/2012 |  | 3/28/2019 |  | 3/26/2012
| 25.0 |  |  | 4/13/2012 |  | 4/16/2012 |  | 4/1/2019 |  | 4/12/2012
| 44.3 |  |  | 1/11/2013 |  | 1/15/2013 |  | 12/15/2019 |  | 1/11/2013
| (a) forward swap |  |  |  |  |  |  |  |  |
| (b) operating lease |  |  |  |  |  |  |  |  |
As of September 30, 2013, the total notional amount of our variable interest rate swaps on debt and an operating lease was $411.4 million and $13.0 million, respectively.

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41620-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579240-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41641-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41638-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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